This area was originally occupied by the Tongva people. European settlement can be traced to a Spanish soldier, Manuel Nieto, who in 1784 received a Spanish land grant of 300,000 acres (1,200 km2), Rancho Los Nietos, as a reward for his military service and to encourage settlement in Alta California. Nieto’s western area was reduced in 1790 because of a dispute with the Mission San Gabriel, but he retained thousands of acres stretching from the hills north of Whittier, Fullerton and Brea, south to the Pacific Ocean, and from today’s Los Angeles River on the west, to the Santa Ana River on the east.